Choanoflagellates have been important for the study of cell communication evolution because choanoflagellates have:a
protein kinases similar to those in animals.
b. G proteins different from those in prokaryotes.
c. signaling molecules similar to those of other protists.
d. signal transduction pathways unlike those in other bacteria.
e. signal transduction pathways that interfere with the cells they infect.
a
You might also like to view...
The pattern of species evolution known as ________ is one of branching in which an ancestral species gives rise to two or more new species
Fill in the blank(s) with correct word
Cope's rule, that animals tend to increase in size over evolutionary time, is a(n)
A. driven trend, because natural selection always favors larger animals. B. active trend, because there is a persistent bias against smaller animals. C. passive trend, because there is a minimum size under which animals cannot function, but increased variance in size moves the mean and maximum upward. D. case of saltation, because increases in size occur by great jumps. E. example of phylogenetic niche conservatism, because ecological niches favor the large.
Which structures are homologous to testes in human females?
a. Cowper’s gland b. prostate c. ovaries d. greater vestibular glands
Which statement about chemical or electrical synapses is true?
a. Electrical synapses require a neurotransmitter. b. In electrical synapses, presynaptic and postsynaptic neurons are separated by synaptic clefts. c. Electrical synapses store excess ions in synaptic vesicles. d. In chemical synapses, presynaptic and postsynaptic neurons are connected by a protein channel. e. Electrical synapses involve the transfer of ions from presynaptic to postsynaptic neurons